diff --git a/Objects/listsort.txt b/Objects/listsort.txt
index 47fec1d0a1c..3ec4393f0ee 100644
--- a/Objects/listsort.txt
+++ b/Objects/listsort.txt
@@ -60,6 +60,7 @@ Comparison with Python's Samplesort Hybrid
       /sort: ascending data
       3sort: ascending, then 3 random exchanges
       +sort: ascending, then 10 random at the end
+      %sort: ascending, then randomly replace 1% of elements w/ random values
       ~sort: many duplicates
       =sort: all equal
       !sort: worst case scenario